MOA is Minute of Angle. It is measured in degrees, minutes, seconds of angle. 1 MOA is roughly 1 inch at 100 yards, a little over 2 inches at 200 yards, a bit over 3 inches at 300 yards.
Mil is Milradians, I don't have knowledge of how milradian works other than it is arc measurements.
I prefer MOA, mostly because I use angle measurement at work. If you study both you can decide which is better for you. Both work in a similar manor, using different measurement systems. People that learn mil say it is better. But I will stick with MOA. I'm stubborn. Use what works for you
You can't fix stupid....however ignorance can be cured through education!